The bipartisan leadership of the House Intelligence Committee Thursday called on the White House to provide a more complete response to the question of whether there are secret recordings of Trump’s conversations with former FBI Director James Comey.

Trump said in a pair of June 22 tweets that he “did not make” and does “not have” any such recordings. Yet the panel’s chairman Mike Conaway, R-Texas, and ranking Democrat California Rep. Adam Schiff, urged the White House to “appropriately and full comply with the committee’s June 9 request” for any recordings.

Notably, the panel leaders implied they might use their subpoena power if the White House does not meet their request. “Should the White House not respond fully, the committee will consider using compulsory process to ensure a satisfactory response.”

In the wake of his abrupt firing of Comey on May 9, Trump appeared to threaten his former FBI director, by suggesting over Twitter that there may be tapes of their contacts. The tweet sparked a debate in Washington over whether Trump kept recordings of his conversations – which the White House for weeks refused to confirm or deny.